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The actor you know and love as Michael J. Fox turns 50 on June 9, 2011. (Alex P. Keaton, you're middle-aged!) But here's another bit of trivia you may not know about him: He was born Michael Andrew Fox in 1961, and gave himself the fake middle initial of "J." upon registering with the Screen Actors Guild (to differentiate himself from a character actor already known under the name "Michael Fox"). It's a small tweak -- certainly smaller than the name transformations many Hollywood stars have undergone through the years, in order to make their names simpler, or less ethnic, or more "zingy." In this gallery, meet a few famous folks originally named Ramon, Demetria, Archibald ...(Photo: Maureen Donaldson/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures